Method of adjusting radiation image read-out conditions

Details Method of adjusting radiation image read-out conditions Method of adjusting radiation image read-out conditions

1986-08-28

1989-09-05

Howell, Janice A.

Radiant energy

Automatic/serial detection of similar sources

2504841, G03C 516

Patent

active

048641332

ABSTRACT:
In a radiation image read-out method using a stimulable phosphor sheet, read-out conditions in final read-out are adjusted based on preliminary read-out image information on a region recognized as an irradiation field. To recognize the irradiation field, sample image signals are extracted from preliminary read-out image signals at a picture element string extending from an end towards the center of the stimulable phosphor sheet. Changes between image density levels represented by the sample image signals are expressed by an approximate equation, and differences between imaginary image density levels calculated by the approximate equation and the actual image density levels are calculated. Or, the image density changes are expressed by approximate equations for picture element groups, and differences between imaginary image density levels calculated by the approximate equations in each picture element group are calculated. Or, intersections of lines represented by the approximate equations and an image density change curve higher than a predetermined density level and represented by the sample image signals are detected, and the intersection nearest to the sheet end is recognized as an edge of the irradiation field.

REFERENCES:
patent: 4276473 (1981-06-01), Kato et al.

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